I was. We did have non-traditional sisters but it was hard for them to be active sisters and it made for some tense times at chapter meetings, especially when talking time commitments for fundraisers and other house business.
Greek life is a great way to meet people but, as everyone has mentioned, it takes a very big time and financial commitment. For example, when I joined (lo these many years ago), it was not uncommon for me to have 2-5 hours worth of chapter meetings to attend (when I wasn't in an office it was 2 hours weekly) weekly and weekly assigned time to perform community service (about 1-2 hours/week).
During rush time a 3 week block of time was required -- the actual rush parties (required attendance) which took about 8 hours per week and then the "hash/membership selection" meetings directly following which could go on for hours. I remember one that lasted from 10:00 p.m. until 3:00 a.m. Again, required. And then there's rush practice...ugh!!!
We were also required to show up for a minimum percentage of parties as well -- I think it was 80% of scheduled parties with other fraternities/sororities.
Financially, there were dues which were paid at the beginning of each semester. There were additional costs -- formals, party costumes, and the like. Thank goodness for the "used formal dress" closet...I visited that many times
I lived in the house so I also had to pay room and board -- cheaper than dormitory living at the time but still quite expensive. All sisters were required to live in the house for 1 year as condition of their membership. It was nice there so I didn't mind that rule
If you go through rush, make sure you ask up front about the required time commitment. It can be a real killer if you have other responsibilities -- I can't imagine doing it if I had a family to care for.
Despite these requirements, it was a very valuable experience and one that I treasure to this day.